Author: Joseph Delgadillo

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this tutorial we are going to be learning about the conditional statements available to you in Python. So, we’re going to be learning about the if-else statement, and this is basically provides us a way to evaluate if something is true or false, and then perform something whether or not the condition is met. Let’s write an if-else statement.

check = True

if check == False:
print("It is false")
else:
print("It is actually equal to True")

This is going to print out “It is actually equal to True” in the console. First, Python is going to check if the variable is equal to false. Else, it’s going to continue through the script and print, or perform, whatever we tell it to do. This is great if we only have two conditions, but what if we want to use more than two? Between the if and else we can use an elif statement, and here we can supply an additional condition.

check = Hamburger

if check == False:
print(“It is false”)
elif check == “Hamburger”:
print(“Yummm, hamburgers”)
else:
print(“It is actually equal to True”)

When we run this script it’s going check to see if the first condition is true, if not it will check the next condition, if not it will print the else statement. So, that’s what an if-statement is, and these are necessary for the project we are about to begin working on.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

Welcome back everyone. This is the final tutorial in the subsection for functions, and we’re going to be talking about return values from functions. Again, this may not be new to some of you as it is a fairly basic concept. So, in the past videos we have been using functions to print something out, but what if we want to return that value and do something else with it? Let’s go ahead and define a function.

def do_math(num1, num2):
return num1 + num2

do_math(5, 7)

Now when we run this bit of code, it’s not going to print anything in our Python console because we didn’t tell it to. Let’s add on to this.

def do_math(num1, num2):
return num1 + num2

math1 = do_math(5, 7)
math2 = do_math(11, 34)

print("First sum is", math1, "and the second sum is", math2)

When we run this we get the First sum is 12 and the second sum is 45. So, again, this a very simple example, but we will expand on this when we build our calculator.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this video we are going to discuss passing an infinite number of arguments in to a function. So, let’s go ahead and write a function.

def print_people(*people):

So, here we have a function called print_people, and the asterisk tells this argument that it’s going to be an array of all the arguments that are passed in to the function. This may result in 1, 100, 1,000, etc. arguments, and we will see how this works in a moment. With an array we need some way to loop over it, and so we’re going to be using a for statement.

for person in people:
print("This person is", person)

Basically, the for loop allows us to iterate over the people list and pass the values into our function as arguments. Again, if you’re familiar with other programming languages this is not a new concept, it’s just a slightly different way of doing it. Let’s call the print_people function and pass it some names.

print_people("Nick", "Dan", "Jack", "King", "Smiley")

What we’re doing here is passing 5 arguments. Now if we knew we were always going to expect 5 arguments, we could accept each individual argument as it’s own variable. However, if we don’t know the total number of values, we are going to create an array stored in the variable called people. So, that’s how to include an infinite, or flexible, number of parameters. In the next tutorial we will cover return values.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

Alright! So, let’s talk about keyword arguments. The first keyword, or boolean, that we are going to cover is None. Basically, this is the equivalent to null in other languages. So, let’s go ahead and write our previous function.

def print_something(name = "Someone", age = "Unknown"):
print("My name is", name, "and my age is", age)

print_something(None, 27)

There isn’t a way to pass in an argument that isn’t first one being used unless we use keyword arguments. We can also define the variable when we call the function.

def print_something(name = "Someone", age = "Unknown"):
print("My name is", name, "and my age is", age)

print_something(age = 27, name = "Nick")

By using keyword arguments, we can specify which value is supposed to go in a particular variable.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this video we were going to discuss arguments a bit further, and we were going to move on to keyword arguments. Before we do that however, it is going to make more sense to cover default arguments first. So, let’s go ahead and write a function.

def print_something(name, age):
print("My name is ", name, + " and my age is " + age)

print_something("Nick", 27)

This won’t run. Remember, when we concatenate strings we must convert integers to strings as well. While we could use the str function to fix our code, it is much easier to separate the four pieces of data with commas.

def print_something(name, age):
print("My name is", name, "and my age is", age)

print_something("Nick", 27)

The results will be the same as if we converted the integer to a string and concatenated the four strings together. So, what happens if we only want to pass our function 1 of the 2 values? This is where we can use default arguments.

def print_something(name = "Someone", age = "Unknown"):
print("My name is", name, "and my age is", age)

print_something("Nick")

When we run this bit of code, Python will print out My name is Nick and my age is Unknown. As you can see, Python will default to the argument we provided it if no data is given.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

Let’s get into user-defined functions. Now, every programming language has functions, however they are going to look different depending on the language. If you have any experience with PHP or JavaScript, functions in Python are going to look similar. So, we are now past the need to use terminal, and from here on out we are going to use our IDE. In addition to functions, we are going to cover a few of the PEP guidelines. PEP is basically a style guide for the Python language, and the first thing we need to do is drop down two lines from the top of the script. To begin defining a function in Python, all you need to do is type the word “def”. When naming functions we must be mindful of the PEP guidelines. With Python you will be using snake case, words separated with underscores, when naming your function.

def my_function():

Within the parenthesis we can pass parameters into our function, then we end the line with a colon. So, now we have a function but it doesn’t perform any actions, yet.

def my_function():
    print("This is my function!")
    print("A second string.")

my_function()

Now our function will print out two strings. Notice that our IDE automatically indents 4 spaces. When you indent in Python you are creating block of code. When we skip a line and remove the indentation, we are telling Python that our function is completed. Lastly, we will call our function. In the next video we will talk about arguments and how use them inside your function.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this video we are going to talk about a few of the built-in functions available in Python, and then we’re going to get into defining our own functions, and the different parts of a function. So, these are some basic (very basic) functions that we need to learn about. We are not going to get into any specific modules like the math module, or anything like that, I’m just going to demo a few basic functions. A few of these we have already use earlier in the tutorial series.

print
str
int
bool
len
sorted

In the next video we will begin building our own functions.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this video we are going to cover variables in Python, and as you may have guessed, a variable is an object that is variable in nature. So, why do we use variables in our code? Well, when we explicitly write strings they are not reusable. If I were to simply write “This is a sting,” I would be unable to reuse that line of code later on in my script. So, one reason we use variables is for re-usability. Another reason we use variables is for passing values into functions, but we will get into that in a later video. The nice thing about Python is that we don’t need to declare or define the type of variable. Creating a variable is as simple as this:

greeting = "hello world"

When you hit enter in your terminal or command prompt, Python will not output a response. However, when we call our new variable, Python will print out “hello world”

print(greeting)

Now that the greeting variable is stored in memory, we can make changes to it.

greeting = greeting.split (" ")[0]

If we print(greeting) now it will returns hello. We can write the following to return hello nick:

print(greeting + " Nick")

In the next video we’re going to be talking about some of the built-in functions available to you in Python.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato

Get The Learn to Code Course Bundle!
https://josephdelgadillo.com/product/learn-to-code-course-bundle/

Enroll in The Complete Python Course on Udemy!
https://www.udemy.com/python-complete/?couponCode=PYTHONWP

In this video we will cover dictionaries in Python. In the previous video when we created a list we used square brackets and comma separated values. To create a dictionary we will use curly brackets instead of the square brackets. In a previous video I may have mentioned that we do not use curly brackets in Python, and that was a lie. What I meant is that we don’t need to wrap code blocks in curly brackets like PHP or JavaScript. So, let’s go ahead and define a dictionary.

{"name": "Nick", "age": is 27, "hobby": "code"}

As you can see, instead of just comma separated values we used in the list, the dictionary uses a key and a value separated by a colon. You can access an item in the dictionary like so:

{"name": "Nick", "age": is 27, "hobby": "code"}{"name"}

Python will then print out “Nick.” Dictionaries will be very important when we get to the JSON part of the course, because we will need to parse though a ton of data.

Web – https://josephdelgadillo.com/
Subscribe – https://goo.gl/tkaGgy
Follow for Updates – https://steemit.com/@jo3potato